I'm really lost for what to do here, and this is happening with several examples of email lists in csv format.
I am trying to import a CSV of email signups that were people who came directly to a landing page and entered their information in order to receive ticket presale notifications. All of the emails are valid (I even recognize a handful of them) and are 100% voluntary signups of people who engage with our business.
Additionally, there are a few I am importing from venues we work with. They are lists on which people opted into marketing communications. As for the quality of t